It’s not the only tech platform that needs to crack down on such illegal content, according to data gathered by the National Center for Missing & Exploited Children, or NCMEC. But Amazon is doing comparatively little to proactively address the problem, experts and law enforcement officials say, attracting people who want to trade such material because there is less risk of detection than in the brighter corners of the internet.

NBC News reviewed court documents from 72 state and federal child sexual abuse or child pornography prosecutions where the defendant allegedly used Wickr (as it’s commonly known) from the last five years in the United States, United Kingdom and Australia, using a combination of private and public legal and news databases and search engines. Nearly every prosecution reviewed has resulted in a conviction aside from those still being adjudicated. Almost none of the criminal complaints reviewed note cooperation from Wickr itself at the time of filing, aside from limited instances where Wickr was legally compelled to provide information via a search warrant. Over 25 percent of the prosecutions stemmed from undercover operations conducted by law enforcement on Wickr and other tech platforms.

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